Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, idempotentHint=true, readOnlyHint=false, and openWorldHint=true, so the safety profile is fully covered by structured data. The description adds one genuinely useful piece of context beyond that: the document's embeddings are deleted as well, a cascade effect the annotations do not express. It stops short of stating irreversibility, permission requirements, or behavior when the id does not exist.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.